Entain Is Set to Drop Out of the FTSE 100 at the September Review

FTSE Russell's indicative screen has the Ladbrokes owner leaving the index alongside Persimmon, with easyJet and Ithaca Energy replacing them. The confirmation comes on 2 September and the change bites on the 21st.

• Indicative screening for the September quarterly review of the FTSE UK Index Series has Entain leaving the FTSE 100 alongside housebuilder Persimmon, with easyJet and Ithaca Energy promoted in their place
• The changes are indicative, not final: the review is confirmed after the close on 2 September using data to 1 September, and takes effect at the start of trading on Monday 21 September
• Entain is valued at roughly £3.4 billion on the screening, against Persimmon at about £3.8 billion, both below the threshold that protects an incumbent constituent
• Demotion is mechanical rather than a judgment on trading, but it forces index-tracking funds benchmarked to the FTSE 100 to sell, and removes the company from the default UK large-cap screen
• Entain has spent the year in restructuring, including a phased exit from central and eastern Europe worth €425m and a €100m provision against an Australian anti-money laundering investigation

The Index Is Doing Arithmetic, Not Passing Judgment

The FTSE UK Index Series is reviewed quarterly, in March, June, September and December, against a rules-based screen of full market capitalisation. A company already in the FTSE 100 is relegated when it falls below the rank threshold the ground rules set for incumbents, and the constituent ranked above it in the FTSE 250 is promoted. There is no discretion, no committee view on strategy, and no assessment of the underlying business.

On the indicative screen circulated this week, Entain and Persimmon are the two leaving. easyJet and Ithaca Energy, the North Sea oil and gas producer that combined with Eni's UK business in 2024, are the two arriving. Entain is valued at roughly £3.4 billion on the data behind the screen.

The word to hold on to is indicative. FTSE Russell publishes an early screen, then confirms the review after the market closes on 2 September using data as at 1 September, with the resulting changes effective from the open on Monday 21 September. Movement in the intervening days can and regularly does change the outcome, particularly where two companies are close in rank.

For a company that spent years as one of the two London-listed operators in the FTSE 100, the symbolism is heavy. Entain has been through a long stretch of repair: a phased withdrawal from central and eastern Europe, the closure of more than a third of its Irish Ladbrokes estate after a sale collapsed, a €100m provision against an Australian anti-money laundering investigation, and a criminal bribery process reaching a former chief executive. It has also reported growth in the UK and at BetMGM.

Relegation Costs Real Money Even Though It Means Nothing

The analytical trap here is to treat an index change as pure symbolism, and the second trap is to treat it as a verdict. Neither is right. Funds benchmarked to the FTSE 100 must sell a relegated constituent, mechanically and on a known date, which produces forced selling into a market that has had three weeks to position for it. That is a genuine cost to existing holders and it is entirely disconnected from how the business is trading. At the same time, the FTSE 250 is not a punishment: it is a different tracker base, and several companies have compounded happily there for years. What relegation does change is visibility. A UK institution screening large caps no longer sees Entain by default, and for a company that needs patient shareholders while it finishes a restructuring, losing the default screen is the part that matters.

The Sector Has Been Repriced, Not Just This Company

It would be easy to read this as an Entain story, and mostly it is: the company has carried an Australian AML provision, a bribery process touching a former chief executive, and an estate it has been shrinking on two continents. But look at the wider list. evoke has just been taken private, Flutter completed its London delisting this month, and the UK-listed gambling sector has been shrinking as a share of the domestic market for several years. A gambling company leaving the FTSE 100 in the same quarter that the sector faces a duty increase is a data point in a longer pattern about where this industry is valued, and London is not winning that argument.

A Confirmed Demotion Would Land in a Bad Month

The effective date is 21 September, which places the forced selling in the same window as the autumn fiscal debate, with the Betting and Gaming Council putting £1 billion of activity on the black market in the month duty rises. None of that is caused by the index change, and the index change does not make the tax worse. But a demoted share price is a weaker platform from which to argue that further duty increases will damage a fragile licensed sector, because the counter-argument writes itself: the market has already marked this down. Entain will want the 2 September confirmation to go the other way, and on a £3.4 billion valuation with three weeks of trading still to run, it is not yet settled.

The index is only measuring what the market decided months ago. Confirmation on 2 September is the thing to diary, not this week's screen.